Install iLife ‘09 and iWork ‘09 on 10.5.2

go into
System>Libary>Core Services>SystemVersion.plist
copy the file to your desktop! change both 10.5.1 in 10.5.6
save it and replace the old SystemVersion.plist with your new one
install iLife and iWork
change it back into 10.5.1 otherwise Aople tries to give you the Updates for 10.5.6